BESEN - A complete ECMAScript 5th edition implementation with a JIT

[BeRo]

I want to post here my newest project named BESEN. BESEN is an acronym for "Bero's EcmaScript Engine", and it is a complete ECMAScript Fifth Edition Implemention in Object Pascal, which is compilable with Delphi >=7 and FreePascal >= 2.5.1 (maybe also 2.4.1).

BESEN is licensed under a RubyLike+AGPLv3 dual-license.

Features:

• Complete implementation of the ECMAScript Fifth Edition standard
• Own bytecode-based ECMA262-complaint Regular Expression Engine
• Incremental praise/exact mark-and-sweep garbage collector
• Unicode UTF8/UCS2/UTF16/UCS4/UTF32 support (on ECMAScript level, UCS2/UTF16)
• Compatibility modes, for example also a facile JavaScript compatibility mode
• Bytecode compiler
• Call-Subroutine-Threaded Register-based virtual machine
• Context-Threaded 32-bit x86 Just-in-Time Compiler (x64/AMD64 JIT is in the work and a ARMv7 EABI JIT for ARM CPUs with VFPUv1 instruction set is planned)
• Constant folding
• Dead code elimination
• Abstract-Syntax-Tree based optimizations
• Type inference (both exact and speculative)
• Property Inline Cache
• Perfomance optimized hash maps
• Self balanced trees (for example to sort on-the-fly linked list items of hash maps for very fast enumeration of array objects)
• Easy native ObjectPascal class integration (properties per RTTI and published methods per by-hand-parsing of the native virtual method table)

And here is the link to BESEN: http://besen.sourceforge.net/

Have fun with it

EDIT: Moved to SF.NET

[Stoney]

Wow, I've been looking for something like this to be integrated into my game engine.
At the moment I'm using the Thorium scripting language (german link) for this task.

Just took a quick look at it, but it failed to compile on Mac OS X 10.6.3 (Intel) with FreePascal 2.4.0 (just wanted to test if it would work with 2.4.0, I will use a more recent FPC version tomorrow) with some errors about wrong parameters for FormatDateTime and StrToDateTime.

Well, as I said I will take a more thorough look at BESEN tomorrow.

[jdarling]

Ok, this is truly awesome. Downloading now and will give it a shot in the versions of Delphi and FPC/Lazarus I have installed. Is this a full hand implementation or did you use a compiler builder (lex, coco, etc) for it?

PS: How long till we see the docs

- Jeremy

[BeRo]

Yeah, BESEN is a full hand implementation. I hate lexer and parser generators Only the unicode lookup table constant arrays are auto-generated.

I've fixed two bugs today (due to a >>= >>>= and <<= code generator bug), so a new version is online now. And i've added some hints to the BESEN webpage due to the code runtime perfomance.

As said, it's is for FPC >=2.5.1 and Delphi >=7, so that FPC 2.4.0 isn't usable for it, because of old Delphi7-incompatible FormatDateTime definitions and so on.

[VilleK]

Impressive!

You keep making "impossible" projects with Pascal, BeRo!

[phibermon]

Excellent work! I shall be having a play

[chronozphere]

This looks quite interesting. I'll give it a shot when i find the time.

[arthurprs]

100% impressive!

[BeRo]

Thanks for all your feedback. I've made BESEN even compatible for to FPC 2.4.0 now, and fixed some bugs and moved to Sourceforge.

[JernejL]

Why would anyone write something like this is beyond my logic, but you really did write something very VERY nice here. Despite my hate for javascript from web programming i do every day something like this in a simplier form would be pretty suitable as a game scripting programming language, the only issue i see would be license (GPL/Custom), but i'll try to evalute it and see where i go from there.

Really nice work, i was pleasantly suprised to see something this advanced on this forum.